🔧 Highlander - Taillight Bulb Replacement

On your Highlander, some rear lighting functions are replaceable “bulbs,” but others are LED modules that don’t have a simple bulb to swap. The most common serviceable rear bulbs are the rear turn signal (outer lamp on the body) and the reverse light (lamp on the liftgate).

Quick check: Which function are you replacing—turn signal, reverse, or something else (tail/brake)?

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Turn the ignition OFF and remove the key/fob from the vehicle.
• ⚠️ Let bulbs cool before touching; they can get very hot.
• ⚠️ Don’t touch the new bulb glass with bare fingers; oil can shorten bulb life. Use gloves or a clean towel.
• ⚠️ Support trim panels as you loosen them so you don’t crack clips.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" socket extension
• Trim removal tool (plastic)
• Small flat-blade screwdriver
• Torque wrench (in-lb or low-range Nm)
• Nitrile gloves
• Safety glasses
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear turn signal bulb (7440) - Qty: 2
• Reverse light bulb (7440) - Qty: 2

Note: If your tail/brake light is out, it may be an LED module issue (not a bulb). Tell me which light is out and I’ll point you to the correct fix.

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📋 Before You Begin

• 🅿️ Park on level ground and open the liftgate.
• 🔦 Turn on a flashlight so you can see inside the rear trim area.
• 🧤 Put on gloves to keep oils off the bulb glass.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm which bulb you’re replacing

• Have a helper press the brake, turn on the hazards, and shift to reverse (engine ON, foot on brake) to confirm what’s out.
• Turn the vehicle OFF again before you start removing parts.

Step 2: Replace the rear turn signal bulb (outer taillamp on the body) — do one side at a time

• Use a trim removal tool (plastic) to pop off the small access covers/panels in the cargo area trim behind the taillamp.
• Use a 10mm socket with a ratchet and extension to remove the taillamp retaining nuts.
• Carefully pull the taillamp assembly straight back to release the locating pins/clips. Wiggle gently—don’t pry the lens.
• Find the turn-signal bulb socket (twist-lock). Turn it counterclockwise by hand to remove it.
• Remove the old bulb by pulling it straight out, then install the new 7440 bulb by pushing it straight in.
• Reinstall the socket: insert and twist clockwise until it locks.

Step 3: Reinstall the outer taillamp

• Line up the locating pins and press the taillamp straight into place.
• Start the nuts by hand first to avoid cross-threading.
• Use a torque wrench with a 10mm socket: Torque to 5.5 Nm (49 in-lbs).
• Snap the cargo trim access covers/panels back into place by hand.
• Repeat Step 2 and Step 3 on the other side.

Step 4: Replace the reverse light bulb (liftgate lamp)

• Open the liftgate and locate the reverse light area on the liftgate lamp assembly.
• Access the bulb socket from behind (through the liftgate inner trim access, if equipped).
• Turn the socket counterclockwise by hand to remove it.
• Pull out the old bulb and install the new 7440 bulb.
• Reinstall the socket by twisting clockwise until it locks.
• Repeat for the other reverse bulb if you’re doing both.

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✅ After Repair

• ✅ Test all rear lights: tail, brake, turn signals, hazards, and reverse.
• ✅ Make sure each bulb socket is fully locked (a loose socket can cause intermittent operation).
• ✅ Confirm the taillamp sits flush with the body and liftgate (no gaps).

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💰 DIY vs Shop Cost

Shop Cost: $120-$250 (parts + labor)

DIY Cost: $10-$40 (parts only)

You Save: $110-$210 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.